Methyl chloroformate → Flometoquin

Participants

Reaction Conditions

Reaction Steps

Dimethyl acetamide (980 ml) and 98 g of 2-ethyl-3,7-dimethyl-6-(4-(trifluoromethoxy)phenoxy)quinolin-4(1H)-one were charged into a glass flask equipped with a stirring device, a thermometer, a reflux condenser, and a calcium chloride tube and having a volume of 2000 ml under a nitrogen atmosphere, and the mixture was cooled to 15° C. 55% sodium hydride (18.2 g) was added thereto, and the mixture was stirred at 15 to 20° C. for one hr. Methyl chloroformate (32.1 g) was added dropwise, and a reaction was allowed to proceed at room temperature for one hr. The reaction mixture was poured into 5 L of ice water contained in a 10-L plastic container, and the mixture was stirred at room temperature for 2 hr. The precipitated solid was collected by a suction filter and was washed with n-hexane and water. The solid was dried in vacuo to give 2-ethyl-3,7-dimethyl-6-(4-(trifluoromethoxy)phenoxy)quinolin-4-yl methyl carbonate (103.3 g, yield 91.4%).

Provenance & Evidence